Polymer light emitting diode

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    12-Jan-2017
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Transcript of Polymer light emitting diode

POLYMER LIGHT EMITTING DIODES

POLYMER LIGHT EMITTING DIODEPLEd-ByJ.PRANAYJ.NIKHIL KUMAR

What do you mean by pled???In light emitting diodes by using polymers we can make more efficient LED displays.These are majorly very useful for the displays of portable devices like mobile phones, laptops,etc.In PLEDs we use special type of polymer called -conjugated polymer which has semiconducting properties.Polymers are chains of smaller molecular components called MONOMERS.

HISTORY OF PLEDs1953: electroluminescence in organic materials was observed1987: first OLED with driving voltage of 10V1989: discovery of -conjugated polymers The making first PLED is credited to the Cavendish laboratory Of Cambridge university in 1989. Polyphenylene vinylene (PPV) is the first LEP discovered

Beginning of intensive research because of the advantages of polymers

PLED as a special type of OLED

semiconducting properties-conjugated polymer

ARCHITECTUREThin film of semiconducting polymer is sandwiched between an anode and cathode.ANODE: ITO(INDIUM TIN OXIDE)CATHODE: Metals(depends upon depends upon ).SUBSTRATE: Glass , clear plastic (depends upon depends upon).Voltage is applied between anode and cathode.

Metal CathodePolymerGlass SubstrateTransparent Anode (ITO)

Flexible packaging materialElectrode Flexible electrodeEmitting layer Flexible Semiconducting polymerSubstrate Flexible !!(Glass Plastic)

Flexible Display

TYPES OF LEP(PLED)Flexible Organic Light Emitting Polymers(FOLEP).

Stacked Organic Light Emitting Polymers(SOLEP).

Transparent Organic Light Emitting Polymers(TOLEP)

TRANSPARENT ORGANIC LEP(TOLEP)Substrate is transparent.

LEPs sandwiched between two transparent layers.

Top and Bottom emitting layers.

Better efficiency.

Fast response.

FLEXIBLE ORGANIC LEP(FOLEP)

Built on flexible substrate.

They have the ability to confirm, bend or roll a display into any shape.

Ultra lightweight and thin form.

They are less fragile and more impact resistant.

STACKED ORGNAIC LEP(SOLEP)Array of vertically stacked TOLEP Sub-pixels.

Color is tuned by individually controlling R-G-B subpixels.

It will only turn on the desired color pixel only.

Can be used in large displays.

True color quality.

Screen refreshing rates

Viewing quality

Screen size

Viewing angle

Power consumptionHigher than LCD

Higher than LCD

Size is not limited in PLED display

Glare free up to 180 degrees

Lesser than LCDCOMPARISON WITH LCD

ADVANTAGES .Low production cost Low power consumptionVery thin displaysLarge viewing angleSimple to use Short response timeFlexible & Robust

DRAWBACKSEmitter is sensitive to oxidation and humidityShort lifetime at high luminescence..

APPLICATIONSDisplays Multi or Full color Cell phone displays Television LaptopLightweight Wrist watches.Automobile light systems without bulbs.Roll-up refreshable e-newspaper.

LAPTOPS

TELEVISIONS

CONCLUSION..Have both electrical and optical property

A low cost solution for flat panel display.

Many manufactures are working to introduce a revolutionary changes in the market.

Hazardless to environment.

Simpler and cheaper.

Have some limitations.

Till it is the superior technologyfor the future..

THANK YOU

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